I was once in a very well known “shtiebel” ie minyan factory in flatbush, there was a very old man who came to daven maariv, he came in by himself, his face was VERY severely burnt, his ears were completely singed off, his eyes were shut closed from the scarring, he was literally a train wreck, somehow this very old sickly, disfigured man who was writhing with pain made it to minyan, i am talking to myself no one else, but what excuse do I have not to come to shul.
There are also people who are disabled, some paralyzed lo aleinu, lo aleichem, who I see make it to shul regularly, every day, some limping, some in wheel chairs, some with oxygen tanks. at some point you have to say, these people came to shul to daven, HKBH gave me health today, how can I not get up and go to shul. i wish it didnt take such extreme examples to put things in perspective but seeing these things really made an impact on me
also during the big blizzard this winter, seeing how many people made the trek to shul whether by car or on foot in those conditions was a real chizuk for me